uint8 dart_launch_opening_status
uint16 target_change_time
uint8 first_dart_speed
uint8 second_dart_speed
uint8 third_dart_speed
uint8 fourth_dart_speed
uint16 last_dart_launch_time
uint16 operate_launch_cmd_time

uint8 CLOSED = 1
uint8 OPENING_OR_CLOSING = 2
uint8 OPENED = 0

time stamp
